Heavy-duty waterproofing — withstands rain, spray, river crossings.

500D CORDURA® base lets air OUT, keeps water IN — squeeze to compress.

Synthetic rubber roll-top closure — doesn't wick water into the bag.

2 ladderlock + 2 side-release buckles — even compression for soft items.

Patented 15mm buckle — user-replaceable in the field, no tools needed.

Multiple attachment loops for kayaks, motorbikes, roof racks, snowmobiles.

The HD version uses upgraded fabric construction vs standard STS dry bags: Body Material: - 420D (denier) TPU-laminated ripstop nylon - TPU laminate = waterproof inner coating (bonded to the nylon) - Ripstop = small reinforcement squares (prevents tear propagation) - Higher denier = thicker, more durable fabric - vs standard dry bag fabrics (typically 70D-210D) 10,000mm Hydrostatic Head: - Same excellent rating as the Evac Bikepack Set - Suitable for all wet conditions except submersion - Per FAQ: "the body of the dry bag is waterproof (10,000 mm). However, avoid submersion since water can seep through the roll-top closure of any dry bag" HD (Heavy Duty) Designation: - Thicker fabric for wear-and-tear resistance - Suitable for vehicle-mounted applications (motorbike, kayak, roof rack) - Heavier than standard dry bags (8-13 oz for the bags themselves) - Worth the weight for rugged use Why 420D specifically: - Thick enough for motorcycle abrasion - Puncture-resistant against branches, rocks - Holds shape better than lighter fabrics - Standard for rugged outdoor use

The HD version uses STS's eVac Fabric at the base — a more aggressive version than the Bikepack Dry Bag Set's Evac laminate: Per STS: "Squeeze air out while keeping the contents dry, without the need for a purge valve." What eVac does: - Microporous membrane - Air molecules pass through (larger) - Water molecules don't (smaller, surface tension) - Like Gore-Tex but for dry bag bases Why the base specifically: - Body is waterproof (no air in/out needed via body) - Bottom is where air pools when filling - Squeeze the bag → air out through the base - The base breathes but doesn't leak water Use technique: 1. Load gear into the bag 2. Roll the top 3-4 times and buckle 3. Squeeze the bag (or sit on it) to expel air 4. The bag becomes compact + stable 5. Re-squeeze periodically during compression with straps Versus purge valves: - Purge valves are mechanical (push button) - Can break, leak, or get stuck - Evac laminate = no moving parts = more reliable - "Without the need for a purge valve" per STS

The HD's closure uses Hypalon — STS's premium closure material: What "non-wicking" means: - Wicking = capillary action pulling water along fibers - Most nylon closures can wick water a few cm into the bag - Hypalon's smooth surface = no wicking - Water sits on the outside, doesn't migrate inward Why this matters for compression: - Compression means tight closure = minimal dry area above contents - If water wicks past the closure = contents get wet - Non-wicking closure = critical for compression bag use Hypalon material properties: - Synthetic rubber developed by DuPont - Highly UV-resistant - Highly chemically resistant - Flexible at low temperatures (won't stiffen) - Won't degrade from sea water or road spray

The HD has 4 straps for even compression: Per STS: "Eliminate bulging and achieve even compression using the four straps with two ladderlock and two easy-access side-release buckles." Strap configuration: - 2 ladderlock buckles: Permanently tighten (wrap around with webbing fed through ladderlock) - 2 side-release buckles: Quick-release (snap on/off) Compression workflow: 1. Pack soft items (sleeping bag, clothing) loosely 2. Roll top closed 3. Pull ladderlock straps tight (these stay tight) 4. Tension with the side-release straps for final compression 5. The bag stays compressed in transport Why 4 straps vs 2: - More straps = more even compression - Less bulging in the middle - Better shape retention - More attachment options (can lash to vehicle) Side-release buckles allow quick access without unthreading ladderlock each time. Common bag-use balance.

The HD includes the patented STS Field Repair Buckle (15mm): What "field repair" means: - Standard buckles are sewn permanently + can't be replaced without tools - Field Repair Buckles have a removable pin design - Replace the buckle with no tools — pull out the pin, snap in the new one Why patented? - STS developed this design - Trademarked - Available aftermarket as a replacement part Practical benefit: - Buy one $5 replacement buckle, extend bag life by years - Don't throw away the bag when a buckle breaks - Compatible with other STS products (some tarps, etc.) Buckle material: 100% Polyformaldehyde (POM, an engineering plastic) — strong, heat-resistant, durable

Per STS: "Strong and secure lash loops for attaching to kayaks, bikes, motorbikes and roof racks." Built-in lash points: - Multiple loops on the bag - Sturdy webbing (100% nylon) - Reinforced stitching at stress points - Accept standard bungee cords, straps, or rope Vehicle attachment examples: - Kayak: Lash to deck rigging or spray skirt - Motorbike: Secure to rear rack or seat strap - Roof rack: Lash to cargo basket or crossbars - Snowmobile: Secure to rear rack - Bike (smaller sizes): Mount to cargo cage (per FAQ) Use cases: - Secure the bag so it doesn't shift during driving/riding - Multiple lashing options for irregular mounting surfaces - Compatible with various lashing systems (bungees, straps, rope)

The Evac Compression Dry Bag HD is Award Winning per STS tags — joining the Dry Bag Collection. What makes it special: - 10,000mm waterproof + 420D durability (rugged) - eVac base (air-out, no purge valve needed) - Hypalon non-wicking closure - 4 compression straps - Field Repair Buckle - 4 sizes from 8L-35L (covers most use cases) - Per FAQ: kayak, motorbike, snowmobile, bikepacking all suitable Best HD dry bag versatility in the STS line: - Soft sleeping bag compression - Bike cargo (smaller sizes per FAQ) - Motorcycle luggage - Roof rack cargo - Kayak deck bag

Different categories within the STS dry bag family: | Aspect | Evac Compression Dry Bag HD (this) | Evac Bikepack Dry Bag Set (sister) | |---|---|---| | Category | Compression Sacks | Storage, Packs & Bags | | Best Use | Compress + protect gear | Bike cargo cage mounting | | Sizes | 8L, 13L, 20L, 35L (4) | 3.7L × 2 (1 set) | | Compression | Yes (4 straps) | No (just roll-top) | | Weight (per unit) | 7.8-13.1 oz | 5.8 oz each | | Mounting | Lash loops, vehicle straps | Stretch-Loc straps, cargo-cage ready | | Base Tech | eVac laminate (more aggressive) | Evac laminate (same) | | Body | 420D TPU-laminated | 420D HD ripstop | | Waterproofness | 10,000mm | 10,000mm | | Bicycle Cargo Cage Use | Possible (per FAQ) | Designed for this | | Compression Use | Designed for this | Not intended | | Vehicle Luggage | Designed for this | Useful too | | Paddle Sports | Yes (per FAQ) | Yes (sister product) | Choose Compression HD for: - Compressing sleeping bags + clothes - Vehicle luggage (motorbike, roof rack) - Larger storage (up to 35L) - Compression is important - Versatile vehicle attachment Choose Bikepack Dry Bag Set for: - Bikepacking-specific cargo cage mounting - Smaller gear (2 × 3.7L bags = 7.4L total) - Comes with Stretch-Loc straps + lash rails (purpose-built) - Frame + fork cargo setup

Compress Sleeping Bags & Clothes (PRIMARY): - Camp quilts, sleeping bags, clothing - Reduce volume by 30-50% via compression - Keep items dry + organized Motorcycling / Overland (per FAQ): - "It is rugged, waterproof and has plenty of attachment points - all of which make it great for motorcycling, snowmobiling" - Hang off rear rack - Weatherproof for long-distance touring Kayak / Paddle Sports (per FAQ): - "Absolutely. The tough nylon material on this dry bag is perfect for water sports" - Lash to deck or rigging - Holds gear that stays dry despite splashes Roof Rack Cargo: - Stack multiple sizes for trip organization - Stack 35L + 20L for gear + clothes - Lash to cargo bars or baskets Snowmobiling (per FAQ): - Cold-weather uses - Durability for impacts - White interior for visibility in dim conditions Bikepacking (smaller sizes, per FAQ): - 8L or 13L = bike cargo options - Compress gear small enough for cargo cage - Same Evac technology as the Bikepack Dry Bag Set Boat / Marine: - Yacht tenders, deck storage - Waterproof + air-permeable for buoyancy-controlled loads - Salt-water tolerant materials Storage at Home: - Off-season gear storage - Compressed sleeping bags in closet - Keeps gear dry + dust-free

STS Field Repair Buckle (15mm, replacement): - Buy extra buckles for long trips - Field-replaceable in seconds - Available from STS support or aftermarket Bungee Cords / Cargo Nets: - Standard vehicle attachment accessories - Pair with the lash loops Tie-Down Straps: - Motorcycle luggage straps - Roof rack tie-downs - Compatible with the integrated lash points TSA Locks (small sizes): - For luggage - Padlock-able lash points Compression Sack Strap Extenders: - Add length to straps for extra-large loads - Useful for bulky winter gear Dry Bag Liners: - Inner bag for extra-waterproof items (electronics, clothes) - Layered protection Vehicle Cargo Nets: - Roof rack or motorcycle attachment - Pair with the compression bag inside STS Evac Bikepack Dry Bag Set (sister product): - For bikepacking-specific bike-mounting